Find the average of the prime numbers between 1 to 20.

9.6

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9.5

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9.2

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9.4

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Solution

The correct option is A 9.6
Prime numbers between 1 to 20 = 2, 3, 5, 7, 11, 13, 17, 19

$A v e r a g e = \frac{S u m o f a l l s c o r e s}{T o t a l n u m b e r o f s c o r e s}$

Sum of all scores = 2 + 3 + 5 + 7 + 11 + 13 + 17 + 19
= 77
Total number of scores = 8

$A v e r a g e = \frac{77}{8}$
= 9.6

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